You seem to be using the Korn shell (or a shell that supports the ksh extended globbing - bash (with shopt -s extglob) or zsh (setopt kshglob).
This is the meaning of these patterns:
* - matches any string, including the null string ? - matches any character . - matches a literal dot fcp - matches the literal string fcp ?(db) - matches 0 or 1 occurrences of the subpattern, the string db in this case.
First, lets take this as an example of why comments are necessary!
Ok in the case statement, the patterns to match follow the shell's file name generation patterns (*=any string, ?=any character, ?(patternlist)). So:
(the *? means the first part must have at least 1 character)
means: if the pattern we are analyzing in the case ($pn.$db)
starts with at least 1 character and
ends in "fcp" or "fcpdb" then the pattern is matched.
If I am correct, this could be written in an easier to
follow way. Here's an example script using ksh that accepts 2 args which are then analyzed
by the case statement:
Note the
could be written as
Using a logical OR, but I am in the habit of splitting them up on their own lines in case in the future the developer maintaining this needs to take a different action on each case. The framework is already set up then.
Also, always allow for the default case which will catch unexpected values passed in!
Depends on what needs to be matched. The * matches the null string too,
so the two patterns * and *? are different (the latter requires at least one character):
Yes, it appears the case pattern means its pattern must start with at least 1 character. My example should have the ? too as in the original.
I will update my example. Thanks!
I need to check the condition of a variable before the script continues and it needs to match a specific pattern such as EPS-03-0 or PDF-02-1.
The first part is a 3 or 4 letter string followed by a hyphen, then a 01,02 or 03 followed by a hyphen then a 0 or a 1.
I know I could check for every... (4 Replies)
Hi all,
I have a pattern matching problem in which i'm not sure how to attack.
Here is my problem:
I have a list of strings that appear in the following format:
String: LE_(1234 ABC)^2^ABC^DEFG
What i need to do is replace all the characters after the first ^ with blank. So the output... (2 Replies)
I inherited a script that contains the following sed command:
sed -n -e '/^.*ABCD|/p' $fileName | sed -e 's/^.*ABCD|//' | sed -e 's/|ABCD$//' > ${fileName}.tmp
What I'm wondering is whether ABCD has a special pattern matching value in sed, such as a character class similar or identical to .
... (9 Replies)
Hi Guys
I am trying to check if the pattern "# sign followed by one or several tabs till the end of the line" exists in my file. I am using the following query:
$ cat myfile | nawk '{if(/^#\t*$/) print "T"}'
Unfortunately it does not return the desired output since I know for sure that the line... (4 Replies)
Hi Guys,
I am trying to setup a check for the string using an "if" statement. The valid entry is only the one which contain Numbers and Capital Alpha-Numeric characters, for example: BA6F, BA6E, BB21 etc...
I am using the following "if" constract to check the input, but it fails allowing Small... (3 Replies)
Hi guys,
I have a file in the following format:
4222 323K 323L D222
494 8134 A023 A024
49 812A 9871 9872
492 A961 A962 A963
491 0B77 0B78 0B79
495 0B7A 0B7B 0B7C
4949 WER9 444L 999O
I need to grep the line... (5 Replies)
Hi,
I am writing a simple log parsing system and have a question on pattern matching.
It is simply grep -v -f patterns.re /var/log/all.log
Now, I have the following in my logs
Apr 16 07:33:17 ad-font-dc1 EvntSLog: AD-FONT-DC1/NTDS ISAM (700) - "NTDS (384) NTDSA: Online defragmentation... (5 Replies)
Hi guys,
got a problem here with sed on the command line.
If i have a string as below:
online xx:wer:xcv: sdf:/asdf/http:https-asdfd
How can i match the pattern "http:" and replace the start of the string to the pattern with null?
I tried the following but it doesn't work:
... (3 Replies)
Hi guys,
I have the following expression :
typeset EXBYTEC_CHK=`egrep ^"+${PNUM}" /bb/data/firmexbytes.dta`
can anybody please explain to me what
^"+${PNUM}"
stands for in egrep statement? Thanks -A (3 Replies)
i can only find the first occurance of a pattern how do i set it to loop untill all occurances have changed.
#! /usr/bin/perl
use POSIX;
open (DFH_FILE, "./dfh") or die "Can not read file ($!)";
foreach (<DFH_FILE>) {
if ($_ !~ /^#|^$/) {
chomp;
... (1 Reply)